> This page is for Voice APIs. > For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://dev.hume.ai/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://dev.hume.ai/_mcp/server. # Welcome to Hume AI > Hume AI builds AI models that enable technology to communicate with empathy and support human well-being. > **Warning** > > **Hume is sunsetting the TTS and EVI APIs.** Access ends November 13, 2026 at 12:01 a.m. EST, and both APIs remain > fully supported until then. Any data in your account is permanently deleted after November 13, 2026. To compare > alternative voice models, see [Real World VoiceEQ](https://www.hume.ai/rw-voice-eq). For questions, contact > [Hume support](/support) or email [assist@hume.ai](mailto:assist@hume.ai). **Hume is a research lab and technology company** with a mission to ensure that artificial intelligence is built to serve human goals and emotional well-being. Hume develops speech-language models that interpret and generate expressive speech, available through two APIs: the Empathic Voice Interface (EVI) for real-time voice interaction and Text-to-Speech (TTS) for expressive speech synthesis. ### [Speech-to-Speech (EVI)](/docs/speech-to-speech-evi/overview) Hume's Empathic Voice Interface (EVI) is an advanced, real-time emotionally intelligent voice AI. EVI measures users' nuanced vocal modulations and responds to them using a speech-language model, which guides language and speech generation. Trained on millions of human interactions, our speech-language model unites language modeling and text-to-speech with better EQ, prosody, end-of-turn detection, interruptibility, and alignment. * **Interviewing & Coaching**: Simulate lifelike interviews or leadership coaching sessions with dynamic tone adjustment. * **Digital Companions**: Build emotionally aware companions for seniors, kids, or mental wellness support. * **Digital Assistants**: Respond with empathy and modulate tone to reduce user frustration or improve engagement. #### [Playground](https://app.hume.ai/evi/playground) Visit our Platform's no-code interface for testing and configuring EVI. #### [API Reference](/reference/speech-to-speech-evi/chat) See our API reference for EVI WebSocket and REST endpoints. ### [Text-to-Speech (TTS)](/docs/text-to-speech-tts/overview) Octave TTS is the first text-to-speech system built on LLM intelligence. Unlike conventional TTS that merely "reads" words, Octave is a "speech-language model" that understands what words mean in context, unlocking a new level of expressiveness and nuance. * **Creative Tools**: Narration for video, podcasting, and audiobooks. * **Education/Coaching**: Deliver lessons with engaging, emotionally varied voice. * **Digital Avatars**: Give realistic voice to AI-powered characters in apps, games, or virtual experiences. #### [Playground](https://app.hume.ai/tts/playground) Check out our Platform's no-code interface for testing Octave's capabilities. #### [API Reference](/reference/text-to-speech-tts/synthesize-json-streaming) See our API reference for TTS streaming and non-streaming endpoints. ### [Voice](/docs/voice/overview) Voice defines how speech is delivered, shaping tone, pacing, accent, and personality. It plays a central role in how listeners perceive meaning and emotion. All voices in Hume's platform are powered by **Octave**, a speech-language model built on LLM intelligence. Octave enables expressive, context-aware speech generation from both text and natural language descriptions. Voices can be used across both **EVI** and **TTS** to tailor how content is spoken. #### [Voice Library](https://app.hume.ai/voices) Explore over 100 expressive voices designed by Hume and available for immediate use. #### [Voice Design](/docs/voice/voice-design) Learn how to create custom voices using descriptive prompts and Octave’s expressive generation. #### [Voice Cloning](/docs/voice/voice-cloning) Clone a voice from a recorded or uploaded speech sample with user consent. ## SDKs Jumpstart your development with SDKs built for Hume APIs. They handle authentication, requests, and workflows to make integration straightforward. With support for React, TypeScript, and Python, our SDKs provide the tools you need to build efficiently across different environments. #### [React SDK](https://github.com/HumeAI/empathic-voice-api-js/tree/main/packages/react) Integrate Hume's Empathic Voice Interface into React apps with tools for audio recording, playback, and API interaction #### [TypeScript SDK](https://github.com/HumeAI/hume-typescript-sdk) Integrate Hume APIs directly into your Node application or frontend Web applications #### [Python SDK](https://github.com/HumeAI/hume-python-sdk) Access Hume's APIs in Python with async/sync clients, error handling, and streaming tools #### [Swift SDK](https://github.com/HumeAI/hume-swift-sdk) Build iOS and macOS apps with EVI voice chat, microphone capture, realtime playback, and TTS file streaming #### [.NET SDK](https://github.com/HumeAI/hume-dotnet-sdk) Use Hume’s APIs in .NET with typed TTS clients, automatic retries, pagination, and configurable timeouts ## Example Code Explore step-by-step guides and sample projects for integrating Hume APIs. Our GitHub repositories include ready-to-use code and open-source SDKs to support your development process in various environments. #### [hume-api-examples](https://github.com/HumeAI/hume-api-examples) Browse sample code and projects designed to help you integrate Hume APIs #### [GitHub Organization](https://github.com/HumeAI/) Explore all of Hume's open-source SDKs, examples, and public-facing code ## Get Support Need help? Our team is here to support you. #### [Discord](https://link.hume.ai/discord) Join our Discord community for direct support from the Hume team ---